A team of researchers has demonstrated the ultimate sensitivity allowed by quantum physics in measuring the time delay between two photons. By measuring their interference at a beam-splitter through frequency-resolving sampling measurements, the team has shown that unprecedented precision can be
A team at the University of Portsmouth has achieved unprecedented precision in measurements through a method involving quantum interference and frequency-resolving sampling measurements. This breakthrough could enhance imaging of nanostructures and biological samples, and improve quantum-enhanced estimation in optical networks.
By measuring their interference at a beam-splitter through frequency-resolving sampling measurements, the team has shown that unprecedented precision can be reached within current technology with an error in the estimation that can be further decreased by decreasing the photonic temporal bandwidth. Dr. Tamma said: “Our technique exploits the quantum interference occurring when two single photons impinging on the two faces of a beam-splitter are indistinguishable when measured at the beam-splitter output channels.
The team proposed the use of a two-photon interferometer to measure the interference of two photons at a beam splitter. They then introduced a technique based on frequency-resolving sampling measurements to estimate the time delay between the two photons with the best possible precision allowed by nature, and with an increasing sensitivity at the decreasing of the photonic temporal bandwidth.
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